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+3=12+5Y+4Y
We move all terms to the left:
+3-(12+5Y+4Y)=0
We add all the numbers together, and all the variables
-(9Y+12)+3=0
We get rid of parentheses
-9Y-12+3=0
We add all the numbers together, and all the variables
-9Y-9=0
We move all terms containing Y to the left, all other terms to the right
-9Y=9
Y=9/-9
Y=-1
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